Network

Network

1. Network Topologies

   • Defination - The devices in a network can be set up in many different ways and the way this is done is called the topology
     • The ring topology
       • A ring network which is also a peer-to-peer network because there is no server.
         • Advantage
           • The network is not dependent on a central computer
             • Each computer has the same access as others so no one computer can hog the network
         • Disadvantage
           • If there is a break in the connection (wire of wireless), then whole network fails
             • faults are difficult to locate
               • it is impossible to keep the network running whilst equipment is added or removed because there is only one path for the data to follow.
     • The bus topology
       • All the devices connected to the network are connected to a common shared cable called the backbone. signals are passed in either direction along backbone.
         • Advantage
           • Cost effective because of the small amount of cable needed
             • simple cable runs make it easy to install
               • easy to add extra devices to the network
         • Disadvantage
           • if more than about 12 devices are connected to the network, then the performance of the network is degraded
             • there is a break in the backbone cable, the network cannot be used
     • The star topology
       • uses a central connection point to connect all the devices on the network together. the central connection point can be a hub, a switch or router

2. Wireless network

   • Many compuetrs are now able to connect to the internet or commuicate with other computers iin a locoal area network wirelessly
     • Example
       • Borad band
       • Wi-Fi enable computers

3. Wi-fi